(19)
(11) EP 1 970 721 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.06.2010 Bulletin 2010/24

(43) Date of publication A2:
17.09.2008 Bulletin 2008/38

(21) Application number: 08004793.9

(22) Date of filing: 14.03.2008
(51) International Patent Classification (IPC): 
G01R 31/36(2006.01)
 H02J 7/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 16.03.2007 JP 2007068593

(71) Applicant: Sanyo Electric Co., Ltd.
Osaka 570-8677 (JP)

(72) Inventors:
  • Matsumoto, Akira
    Moriguchi-shi Osaka 570-8677 (JP)
  • Yugou, Masaki
    Moriguchi-shi Osaka 570-8677 (JP)

(74) Representative: Hertz, Oliver 
v. Bezold & Partner Patentanwälte Akademiestrasse 7
80799 München
80799 München (DE)

   


(54) Current detection apparatus for a car power source


(57) The current detection apparatus is provided with a current detection section (20; 30) that detects charging current and discharging current of the car driving battery (10), a level-shift circuit (40; 50) connected to the output-side of the current detection section (20; 30) that shifts the output of the current detection section (20; 30), and an A/D converter (60) connected to the output-side of the level-shift circuit (40; 50). The level-shift circuit (40; 50) shifts the current detection section (20; 30) output signal to unbalance the maximum discharging current and maximum charging current that can be detected.







Search report